While implementing PEP 498 I found a minor incompatibility between
CPython and Cython: CPython lets you concatenate u-prefixed and
non-prefixed string literals, while Cython throws an error.
jelle@devjelle:~/cython$ cat concat.py
print(u'foo' 'bar')
jelle@devjelle:~/cython$ python concat.py
foobar
jelle@devjelle:~/cython$ cython concat.py
Error compiling Cython file:
------------------------------------------------------------
...
print(u'foo' 'bar')
^
------------------------------------------------------------
concat.py:1:13: Cannot mix string literals of different types,
expected u'', got ''
I tried both CPython 2.7 and 3.5. The documentation at
https://docs.python.org/2/reference/lexical_analysis.html#string-literal-concatenation
is ambiguous as to whether this behavior is intentional.
As part of implementing PEP 498, I can make Cython's behavior match
CPython's, unless there's a good reason to keep the incompatibility.
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